Pencil sharpener



FIG. 1 is an upper frontal perspective view of a pencil sharpener showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1, 4, 5, 6, and 7 are included for the purpose of illustrating environmental matter and form no part of the claimed design. 

The ornamental design for a pencil sharpener, as shown and described. 